(19)

(11)

EP 0 491 790 A1

(12)

(43) Date of publication: 01.07.1992 Bulletin 1992/27 (21) Application number: 90913745.0 (22) Date of filing: 12.09.1990

(51) International Patent Classification (IPC):  H05B 37/ 02( . ) H05B 39/ 08( . ) H05B 37/ 03( . ) H05B 39/ 10( . ) (86) International application number: PCT/SE1990/000582 (87) International publication number: WO 1991/004647 (04.04.1991 Gazette 1991/08)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 14.09.1989 SE 19890003028 (71) Applicant: SWEDISH AIRPORT TECHNOLOGY HB S-831 25 Östersund (SE)	(72) Inventors: BÄCKSTRÖM, Göran S-831 52 Östersund (SE) THORBORG, Kjeld S-439 00 Onsala (SE) (74) Representative: Hopfgarten, Nils  Bergenstrahle & Lindvall AB Box 17704 S-118 93 Stockholm S-118 93 Stockholm (SE)